Inicio Gestión de la energía Controladores CA/CC y CC/CC (FET externo)

UC2907

ACTIVO

Controlador de carga compartida de 35 V y -40 °C a 85 °C

Detalles del producto

Vin (max) (V) 35 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Buck, Flyback Rating Catalog Features 1.25% Reference, Differential Voltage sensing, Load Sharing, Precision current sharing
Vin (max) (V) 35 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Buck, Flyback Rating Catalog Features 1.25% Reference, Differential Voltage sensing, Load Sharing, Precision current sharing
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Fully Differential High Impedance Voltage Sensing
  • Accurate Current Amplifier for Precise Current Sharing
  • Opto Coupler Driving Capability
  • 1.25% Trimmed Reference
  • Master Status Indication
  • 4.5-V to 35-V Operation

  • Fully Differential High Impedance Voltage Sensing
  • Accurate Current Amplifier for Precise Current Sharing
  • Opto Coupler Driving Capability
  • 1.25% Trimmed Reference
  • Master Status Indication
  • 4.5-V to 35-V Operation

The UCx907 family of load share controller ICs provides all the necessary features to allow multiple-independent-power modules to be paralleled such that each module supplies only its proportionate share to total-load current.

This sharing is accomplished by controlling each module’s power stage with a command generated from a voltage-feedback amplifier whose reference can be independently adjusted in response to a common-share-bus voltage. By monitoring the current from each module, the current share bus circuitry determines which paralleled module would normally have the highest output current and, with the designation of this unit as the master, adjusts all the other modules to increase their output current to within 2.5% of that of the master.

The current share bus signal interconnecting all the paralleled modules is a low-impedance, noise-insensitive line which will not interfere with allowing each module to act independently should the bus become open or shorted to ground. The UC3907 controller will reside on the output side of each power module and its overall function is to supply a voltage feedback loop. The specific architecture of the power stage is unimportant. Either switching or linear designs may be utilized and the control signal may be either directly coupled or isolated though the use of an optocoupler or other isolated medium.

Other features of the UC3907 include 1.25% accurate reference: a low-loss, fixed-gain current-sense amplifier, a fully differential, high-impedance voltage sensing capability, and a status indicator to designate which module is performing as master.

The UCx907 family of load share controller ICs provides all the necessary features to allow multiple-independent-power modules to be paralleled such that each module supplies only its proportionate share to total-load current.

This sharing is accomplished by controlling each module’s power stage with a command generated from a voltage-feedback amplifier whose reference can be independently adjusted in response to a common-share-bus voltage. By monitoring the current from each module, the current share bus circuitry determines which paralleled module would normally have the highest output current and, with the designation of this unit as the master, adjusts all the other modules to increase their output current to within 2.5% of that of the master.

The current share bus signal interconnecting all the paralleled modules is a low-impedance, noise-insensitive line which will not interfere with allowing each module to act independently should the bus become open or shorted to ground. The UC3907 controller will reside on the output side of each power module and its overall function is to supply a voltage feedback loop. The specific architecture of the power stage is unimportant. Either switching or linear designs may be utilized and the control signal may be either directly coupled or isolated though the use of an optocoupler or other isolated medium.

Other features of the UC3907 include 1.25% accurate reference: a low-loss, fixed-gain current-sense amplifier, a fully differential, high-impedance voltage sensing capability, and a status indicator to designate which module is performing as master.

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Documentación técnica

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Tipo Título Fecha
* Data sheet Load Share Controller datasheet (Rev. C) 09 ene 2002
Application note U-129 UC3907 Load Share IC Simplifies Parallel Power Supply Design 05 sep 1999

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

UCC39002EVM — Módulo de evaluación UCC39002

The UCC39002 is an advanced, high-performance load-share controller that provides all the necessary functions to parallel multiple independent power supplies or dc-to-dc modules. This load-share circuit is based upon the automatic master/slave architecture utilized in the UC3902 and UC3907 (...)

Guía del usuario: PDF
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
PDIP (N) 16 Ultra Librarian
SOIC (DW) 16 Ultra Librarian

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

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